3-wire multiphase UPS with bypass
a power supply and bypass technology, applied in emergency power supply arrangements, power conversion systems, ac networks with different sources at the same frequency, etc., can solve the problem of power quality event most often a complete failure of the ac source, difficult to achieve efficiency increase based on improvements in presently available hardware, and use of more expensive components
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third embodiment
[0057]FIG. 3 shows a double conversion UPS device 100 according to a The UPS device 100 is connected between a 3-wire multiphase AC source 112 and a 3-wire multiphase load 114. The UPS device 100 is provided for multiphase operation.
[0058]The UPS device 100 comprises a converter part 116 and a 3-wire bypass 118, which are connected in parallel to the AC source 112 and the load 114. The converter part 116 is provided to perform double conversion and comprises an AC / DC converter 120, also referred to as rectifier, which is connected at its AC side to the AC source 112, and a DC / AC converter 122, also referred to as inverter, which is connected at its AC side to the load 114. A DC side of the AC / DC converter 120 and the DC / AC converter 122 is interconnect by a DC link 124, which isolates the AC source 112 from the load 114.
[0059]The converter part 116 further comprises a DC / DC converter 126, also referred to as battery converter, which connects a DC source 128 to the DC link 124. The ...
fourth embodiment
[0064]As can be seen in FIG. 5a, the switching unit 140 of the fourth embodiment comprises an anti-parallel pair of semiconductor switches 142, which are provided together with reverse blocking devices 146.
[0065]FIG. 5b shows a switching unit 140 according to a fifth embodiment. The switching unit 140 of the fifth embodiment can be used in general with the UPS device of the third embodiment.
[0066]As can be seen in FIG. 5a, also the switching unit 140 of the fourth embodiment comprises an anti-parallel pair of semiconductor switches 142, which are provided together with reverse blocking devices 146.
[0067]Subsequently will be described with reference to FIGS. 8 to 12 control of the UPS device 100 as performed by the control unit 132.
[0068]FIG. 8 shows a first mode of continuous duty bypass operation. Hence, all switching units 140 are gated on. This refers e.g. to an eco-mode, where the load 114 is fully supported from the AC source 112 via bypass 118. Hence, gate signals for all swit...
sixth embodiment
[0075]FIG. 6 shows a UPS system 102 according to a The UPS system 102 comprises multiple UPS devices 100 of any of the previous embodiments. The UPS devices 100 are connected in parallel between the AC source 112 and the load 114. The UPS system 102 comprises a communication bus 160, which connects the control units 132 of the individual UPS devices to an overall control unit 132, which performs a common control of the UPS system 102.
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